Improvement in shipping and unshipping propellers



NAPTERS. PHOTO LITHOGRAFHER ASmNeToN n c i UNITED STATES PATENT OFFICE.

STEPHEN R. PARKHURST, or NEwYoR'K, N. Y.

IMPROVEMENT IN SHIPPING AND UNSHIPPING PROPELLERS.

j Specification forming part of Letters Patent No. 4,290, dated November26, 1845.

To all whom it may concern:

Be it known that I, STEPHEN R. PARK- HURST, of the city, county, andState of New York, have invented a new and useful Improvement inPropelling Vessels; and I do hereby declare that the following is afull, clear, and exact description of the principle or character thereofwhich distinguishes it from all other things before known, and of themanner of making, constructing, and using the same, reference being hadto the accompanying drawings, making partof lrhis specilication, inwhic`n- Figure l is a general view of the propellers and the case towhich they are attached. Fig.

2 is a horizontal section through the propel-- 1ers and case. Fig. 3 isa side view of a vessel with the case with the propellers aixed thereto.

The same letters refer to like parts in all the figures.

The nature of my invention is as follows:` "l'he vessel may 'be of anyof the ordinary forms of sailing-vessels, and to this I atlix by any ofthe usual devices on theoutside below the water-line on each side one ormore cases, made of iron or other suitable material, in which are two ormore recesses to receive propellers of small diameter. These cases maybe placed in the center of the length of the vessel on each side, asshown in the drawings, Fig. 8, or may be located near the bow or sternor at the bow and stern both, asisor more in number; but I do notcontemplate using less than four in ordinary constructions. Into therecesses above named I put conical wheels or paddles d, the paddlesradiating/from aconical-shaped drum, the smaller end of which isdownward and is truncated. This end has a flange e on itthat extends outto the outer ends of the paddles. The vertical shaft f of saidpropellers d are extended up to and through the projecting'part of theside of the vessel when that can be effected tothe deck. In other casesthey are sustained outside by proper supports, and on their upper endsare pulleys, cranks, or other analo` gous devices for turning saidpropellers, by which they `are connected with each other and with theengine. The propellers are iutended just to fit the case in which theywork, admitting only two or three paddles to project beyond the case onthe open side. When said propellers are putin operation. they eachstrike the water outside the case, the second one drawing the water fromthe first after it has acted on it, and so on through the series. Itwill be obvious from this construction that the case can at any time beremoved from the vessel, which willleave her in her original v state.These propellers can each be driven by a separate engine, so that if oneengine is out of order the rest can be at work, and engines of a muchsmaller size can be used.

Having thus fully described my improvement, I wish it to be understoodthat I do not claim as my invention the employment of a submergedhorizontal wheel within a case in the vessel, as that has before beenessayed; but

What I do claim as my invention, and desire to secure by Letters Patent,is

The case above described, into which the propellers are inserted to be-placed on the outside of a vessel of the usual form of sailing-vessels,which is independent of and can be taken from said vessel, incombination with aseries of horizontal propellers placed one before theother,in the manner set forth.

STEPHEN R. PARKHURST.

lVitnesses:

J. J. GREENOUGH, A. P. BROWN.

